Re: ortho film

Hi:

I do most of my pinhole work with these media.

I use ortho film. Yes it can be developed under safelight. A standard
film developer will produce a high-contrast film - Ortho film is usually a
high contrast film.

It can be developed to give a continuos tone negative, either by using a
highly diluted paper developers (Selectol, Dektol, Sprint ) etc or a
special low contrast developer (Soemarko LC-1)

Cyanotype is a non-silver process. It must be exposed to ultraviolet
light - the convenient and cheap source of UV light is the sun. Exposure
time it too critical - A proper exposure can be made in a few minutes
under the sun. The color changes as it exposes - so it is easy to judge
when the print has recieved the correct exposure.

Once the print is exposed its taken inside and developed in plain water.
No other processing is necessary - the print are quite archival and will
last for years (100's if properly taken care of).

I don't know of anyone currently selling cyanotype paper. Most people buy
a kit, or the chemicals and coat their own paper. (not difficult) If you
want to try cyanotype I could send you some of the paper I have coated.

The cyanotypes are blue and white, although they can be toned to a warm
reddish brown.

Gord

On Thu, 15 Aug 2002 BenDuross@aol.com wrote:

> Hello Everybody
> I was wondering if anyone could help me. I would like to know more about
> ortho film.
> I have heard it can be developed in a tray under a safe light. Also I have
> heard there are alternative processes called canotypes that can be developed
> in sunlight.
> I would appreciate some information about them
> Cheers
> Ben
>

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Gordon J. Holtslander Dept. of Biology
holtsg@duke.usask.ca 112 Science Place
http://duke.usask.ca/~holtsg University of Saskatchewan
Tel (306) 966-4433 Saskatoon, Saskatchewan
Fax (306) 966-4461 Canada S7N 5E2
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Received on Fri Aug 16 02:35:38 2002